Can forming and trimming machine.



1). MALDE. GAR FORMING AND TBIMMING MACHINE 1,035,984. I APPLICATIONFILED FEB. 25, 1911. 20' E i g. l

I 75 .AI' i W Inventor:

Attorneys ILM I 11a D. MALDE.

CAN FORMING AND TRIMMING MACHINE.

APPLIGATIOII FILED 1511.25, 1911.

1,035,984. Patented Aug. 20, 1912.

2 SHEETSSHBET 2.

fi? x \T 10 Q7 Witnesses: Invan cur: I]- Malia Attorneys unnnn erm nePATENT orat on. i

nnnrnn means, or sravanennynonwnt. can some AND We mcnnm Specificationof Letters Patent.

Application filed rem-na es, 1911. Serial No. emcee. r

, anning. 1912.

To all whom it may concern:

Be it known that I, DANIEL. MALDE, workmaster, citizen of Norway,residing at Stavanger, Norway, have invented new and useful Improvementsin Can Forming and Trimming Machines, of which the following is aspecification.

My invention relates to improvements 1n combined can forming andtrimming machines and has for its object to provide a machine which willbe adapted to operate efiiciently at high speed.

My invention consists in the combination of parts hereinafter describedand claimed.

The invention is illustrated in the accompanying drawings in which-Figure 1 is a vertical section showing the position of the parts beforethe commencement of the pressing operation. Fig. 2 is a similar sectionshowing-the position of the parts when the operation has been completed.

The lower or bed part ofthe machine consists of the stationary form 1,which serves as a matrix for the body of the can, and

around this form arearranged two annuli,

2 and 3, the annulus 2 having a cutting edge l-and serving as thetrimmin die. Studs 4, 5, extend between said annuh and a crosspiece 6bearing against a heavy spring 7. An annular seat 8 is interposedbetween the trimming die 2 and the studs 4:, and the position of saiddie can be adjusted by inserting suitable plates between it and the seat8.

9 is the usual stationary cutting die which coiiperates with the outerdie 10 of the presser head or upper part of the machine. The die -10 isscrewed to the block 12 which serves to guide the rod 13 of theknock-out piston 11 mclosed in said annular die 10.

The studs 4, 5 are of such length that when the parts are in theposition illustrated in Fig. 1 the cutting edge 14 of the annulartrimming die at lies flush with the upper face of the annulus 3. A space15 is left between the annulus 3 and the trimming die 2, this spacebeing such that the annulus 3 can only move downwardly relative to thetrimming die 2 through a distance equal to the thickness ofthe sheetmetal of the can, as seen in Fig. 2. In other words the downwardmovement of the annular member 3 is limited by the die 2, and the extentof this movement can be accurately adjusted by .means ofthe adjustingplates hereinbefore referred to.

When the piece of sheet metal 16 fi-om which the can is to betpressed isplaced upon the lower 'art of e machine, and the resser hea' 1sdepressed, the material for the can is out out in the usual manner bythe dies 9 and 10. In the further downward movement of the presser head,the outer annular edge of the sheet is held between the die 10 and theannulus 3, and the-material is pressed over the form 1, which shapes the'body of the can. The bottom of the can is formed by the piston 11 inthe usual way, and as the operation continues the annulus 3 and thetrimming die 2 gradually recede together until the annular seat 8 abutsagainst the machine frame, as shown in Fig. 2. As the trimming diecannot recede farther, continued downward movement of the presser headcauses the edge 14 of the trimming die 2- to enter the outer flange ofthe can until the pla between the die 2'and the annulus 3 ,is ta on upin the downward movement of said annulus. This takes place at the momentthe cutting edge of the trimming die has passed through the thickness ofthe metal in the flange aforementioned. Owing to the abutment of theannulus 3 against the die 2, no further downward movement of the presserhead can take place, so that the cutting edge 14 cannot possibly enterthe lower face of the annular die 10 and damage it. The bur which isleft on the edge of the rim 17 of the can, after the annular strip 18has been severed therefrom in the manner described above, is directeddownwardly relative to the finished box and this facilitates theoperation of connecting the body of the can with its cover, as will bereadily understood.

It is obvious that the annular cutting die could be rigidly connectedto, or be even made integral with the form 1, the said parts in suchcase being permanently in the position shown in Fig. 2.

Having now described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A can forming and trimming machine comprising a presser head, a bedportion, a trimming die on said bed portion presenting an annularcutting edge, a portion of the presser head presenting a plane annularsurface and adapted to force the edge of a blank against said annularedge,

whereby to trim the can edge, and means to limit the movement of thepresser head tothe remer head presenting aplane annular sur ace andadapted to force the edge of a blank against said annular cutting edge,whereby to trim the can edge, and an annular member associated with-saidtrimming die to limit the movement of said prcsser .head toward the bedportion to prevent it from being damaged by the annular cutting edge ofthe trimming die. v

3. A can forming and trimming machine comprising a bed POI-5011,11presser head, a form.on said bed portion, trimming means consisting of atapered annular cutting die encircling said form, and a correspondinglytapered annulus encircling said annular cutting die and spaced therefromby a distance permitting of the depression of said annulus by thepresser head for a distance equal to the thickness of the sheet ofmaterial under treatment.

4. A can forming and trimming machine comprising abed portion, a presserhead, a knock-out member in said Presser head, an

formingand. machine annular die carried by said presser head andencircling said lmock-out-member; a form on said bod portion, trimmingmeans consisting of a tapered annular cutting die encircling mid form,a. correspondingly tapercd annulus encircling said annular cutting dieand spaced therefrom by a distance rmitting of the depression of saidannulus y theprewer head-for a distance equal to the thickness of thesheet of material under treatment. 1

5. A can forming and trimming machine comprising. a bed portion, apresser head, a form on said bed portion, trimming means consisting of atapered annular cuttmg die encircling said form, a correspondinglytapered annulus encircling said annular cutting die'and spaced therefromby a distance permitting of the depression of said annulus by thepresser head for a distance equal to the thicknws of the sheet ofmaterial under treatment, and an annulus seating supporting the trimmingdie, guiding and liftmg means for said seating, anda. cross-pieceopcratively connected wlth said annulus.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

. DANIEL MALDE.

Witnesses: K. Ronnnnsmn, Fun-n Nnssnnn.

